In the metaphorical sense, the shell might be a "carry-on" bag on wheels, stuffed full of cables, discs, dongles, batteries, plugs and paper documents (just in case of disc failure).

从比喻的角度来看，“壳”就是他们在汽车上背着的一个个包，堆的各种电线、光盘、数码密钥、电池、各种插头和纸面文件(以防光盘失效)。

youdao

And he gave a very good analogy in saying, "it was almost as incredible as if you'd fired a 15 inch shell at a piece of tissue paper, and it came back and hit you."

他还打过一个很好的比方：，“这就像是，你用个15英寸果壳，打到面巾纸上被弹回来打到你，一样不可思议。”

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May: There are also some fine art crafts, including wood carving, shell ornaments and paper-cut.

阿美：那里还卖一些非常不错的工艺品，比如说木雕、贝壳饰品和剪纸。

youdao

And he gave a very good analogy in saying, "It was almost as incredible as if you'd fired a 15 inch shell at a piece of tissue paper, and it came back and hit you."

他还打过一个很好的比方：,“这就像是,你用个15英寸果壳,打到面巾纸上被弹回来打到你，一样不可思议，“

麻省理工公开课 - 化学原理课程节选

Inside it was a fire lantern, glowing gently through its paper shell.

ECONOMIST: Ray Bradbury

He got the seller, be it a Shell or Texaco, to carry most of the paper and then he'd use junk bonds to finance the rest.

FORBES: Magazine Article